<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
  <script>
       var Vue = function () {

       }
       Vue.prototype={
           init:function () {

           }
       }
       Vue.set = function (target,key) {
           console.log(target)
           console.log(key)
       }
       var _vue= new Vue();
       _vue.name='yao guan shou ';
  </script>
</body>
</html>